I would give RCU's site a chance..it will give you a much larger base of people who are into R.C. You can even look around on the sales" site and see what your type of plane is bringing on the open market. This is useful for your pricing structure.
As far as the shipping costs go....... just say in your add that buyer pays all shipping cost......to be determined buy buyers location at end of sale.

As far as payment goes? you can use PayPal if you have it........you can state that all personal checks need 10 days to clear bank before goods ship...... or you can trust the buyer and hope hhe won't rip you off. I have done the trust thing on things under a $100 but over that I get the $$$$$$$$$$ before I ship the goods.

I have always thought???? what gives me the right to get the money before they get the goods? what if I rip them off???
I have never done that but think about it???? kind of one way if you really think about it. But it works............it sure does work.